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A. W. HALL.

Rock Breaking Device.

Patented Oct. 4. 1864.

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UNITED STATES A. w. HALL, on NEW YORK, N. Y.,

ASSIGNOR TO HIMSELF, SAMUEL JAUDON, AND R. H. BELDEN, OF SAME PLACE.

ROCK-BREAKING DEVICE.

Specification forming part of Letters Patent No. 44,580, dated October 4, 1864.

To aZZ whom it may concern.-

Be it known that I, A. W. HALL, of the city, county, and State of New York, have invented a new and Improved Rock-Breaking Device; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side sectional view of my int ention, taken in the line 00 m, Fig. 2; Fig. 2, a plan or top view of the same.

Similar letters of reference indicate like parts.

This invention relates to a new and improved device for breaking rocks, and is more especially designed for crushing gold'bearing quartz, reducing the same to quite fine particles, like fine sand, so that the latter will be in a favorable position to be crushed and have the gold separated from it by amalgamation by any approved device or process.

The invention consists of a crusher composed of a stationary and a movable or oscillatingja-w, the stationary one having a single plane surface and somewhat inclined, and the oscillating jaw having two plane surfaces, one being above the other, with a concave surface between them, the fulcrum-pin of the oscillatingjaw being in a line central with the concave surface, and all arranged in such a manner that a double-crushing operation is performed by the same pair of jaws, the rock being cracked by one operation and reduced to the fine state by the other, as hereinafter fully set forth.

A represents the stationary jaw, the face side, a, of which is a single or unbroken plane surface and inclined, as shown in Fig. 1. This jaw may be of cast-iron, and it is cast with two parallel plates, B B, extending one from each side of the face of jaw A, said jaw and its plates B B resting upon sleepers or any suitable framing.

0 represents the oscillating jaw, which is composed of two plane surfaces, b 1), between which thereis aconcave surface, 0. (SeeFig.1.) The jaw O is at one end of a lever, D, which is fitted bet-ween the plates B B, and works upon a fulcrum-pin, E, the bearings of which are in the plates B B. The jaw (J and lever D are cast in one piece, and said jaw is oscillated by means of pitman F from a crankshaft, G, the bearings of which are in the plates B B. The upper plane surface, I), of jaw G has an inclination backward from the face a of the stationary jaw A, so as to form quite an opening to receive the stone to be crushed, as shown clearly in Fig. 1. The lower plane surface, 1), works quite 'close to the face of the jaw A.

The operation is as follows: The large lumps of stone are placed between the upper parts of the jaws, and are crushed or broken at that point, the crushed pieces passing down into the concave c as the upper surface, I), recedes from the jaw A, and being caught between the lower surfaces 1) and a, where they are reduced to a fine state, like sand. The opera-- tion of the jaw G is sufficiently rapid to prevent any portion of the rock passing through between the jaws without being properly crushed. The concave 0, it will be seen, serves as a sort of hopper to receive the pieces from the upper crushing-surfaces, b a, and introduce them between the lower crushing-surfaces, b a.

Thus it will be seen that two crushing operations are performed between one pair of jaws, the stone being first cracked and then afterward further reduced to the fine state required.

I do not claim, broadly, or irrespective of the construction and arrangement herein shown, a pair of jaws for crushing stone, for they have been previously used; but

I claim as new and desire to secure by Letters Patent-- The stationary jaw A, having a single plane surface, in connection with an oscillating jaw, 0, provided with two plane surfaces, b I), one above the other, with a concave surface, 0, be tween them, to operate in the manner substantially as and for the purpose specified.

A. W. HALL.

Witnesses:

J. P. HALL, M. M. Livtucsrrou. 

